you have to learn land entitlement. we identified a site today for hotel development that was an 18000 sq ft lot.

The Rockcastle Megasite is an example of a site ready property & is only 20 minutes north of London. https://dataispower.org/rockcastle-mega-site/. 

From there they port out to all the normal other sites.

Like others have stated, their price is not always the best especially if you use cashback sites and/or search for coupon codes for other sites.

Is there any good resource with links to the relevant sites in particular states/counties?

The site has changed tremendously. 

I'm on a call now and they same decent and honest, but some reviews on here and other sites are a bit concerning.

10 years ago my property was 90% VRBO, 10% Airbnbsame property 10 years in using both,now it's 90% Airbnb, 10% VRBOsame property, same pictures on both sites, etc.

Quote from @Daniel Amsalem: If you have an Airbnb in DC, Maryland, or Northern Virginia (NOVA) or want to, I'd ask you provide feedback to the City of Alexandria regarding their proposed regulations.Regulations: https://www.alexandriava.gov/sites/default/files/2024-08/sho...Feedback Form: https://www.research.net/r/AlexandriaVA-ShortTermRentalsAlexandria sets the example for all of DMV as the most permissible county/region. 

I also handle any inspections needed before the opening of a site.